FCD-IPM Installation and Operation Manual Chapter 5 Setup Menu
WAN Economy Menu 5-89
Table 5-31. Advanced Filter Parameters (Cont.) Parameter Possible Values Description
Low Level (IP
protocol)
UTP
TCP
ICMP
Toggle to the required low level protocol for the filter. If
the port number is defined in decimal format, specify the
low level protocol as UTP or TCP. If no port number is
defined, specify the low level protocol as UTP, TCP, or
ICMP. Choose True or False.
Low Level (IPX
protocol)
Toggle to the required low level protocol for the filter. If a
socket is defined in the destination address, a low level
protocol or socket number may not be specified.
Conversely, if a socket address or low level is not defined,
a socket number may be specified.
Mask A mask is a test pattern that is used to allow certain frame
patterns only. You define a code against which the frame
is compared.
To create a mask, toggle to Yes. Three pairs of codes and
offsets must be created. The offset defines the point in the
frame at which the comparison is made.
For example, an offset of 8 means that the 8th byte is
compared to the code. The offset can be from the 7th byte
onwards.
The frame is made of 3 different portions:
MAC - is at the beginning of the frame
LLC - is after the source address in the frame
DATA - is after the LLC section in the frame.
For each code-offset pair, select the code format:
Binary - specify 48 address bits to be either 0,1, or X
(unspecified)
Hexadecimal - specify 12 hex digits to be 0-F or X
(unspecified).
For each code-offset pair, choose True or False.
Every frame, at the designated offsets, is compared to the
three codes in the mask. If all three codes and the
True-False condition match the code written in the frame,
the frame passes.
Note: Only one mask can be defined.
Status Active
Not Active
The filter is in use.
Allows you to define filters which can be stored and used
at a later time.
Saving Filter Parameters All filters are stored in the Flash Memory, thereby preserving them if the power goes down. When filtering is selected, all of the filters are copied into the RAM. The RAM copy is then used to activate the software filtering process. Any filter which is modified, (by clearing all, deleting one, or changing a parameter) goes into effect immediately. The previous filter also remains in effect until the system is rebooted.